ain't
American-
Nonstandard except in some dialects. contraction of am not; are not; is not.
-
Nonstandard. contraction of have not; has not; do not; does not; did not.
contraction
Usage
As a substitute for am not, is not, and are not in declarative sentences, ain't is more common in uneducated speech than in educated, but it occurs with some frequency in the informal speech of the educated, especially in the southern and south-central states. This is especially true of the interrogative use of ain't I? as a substitute for the formal and—to some—stilted am I not? or for aren't I?, considered by some to be ungrammatical, or for the awkward—and rare in American speech— amn't I? Some speakers avoid any of the preceding forms by substituting Isn't that so ( true, the case ) ? Ain't occurs in humorous or set phrases: Ain't it the truth! She ain't what she used to be. It ain't funny. The word is also used for emphasis: That just ain't so! It does not appear in formal writing except for deliberate effect in such phrases or to represent speech. As a substitute for have not or has not and—occasionally in Southern speech— do not, does not, and did not, it is nonstandard except in similar humorous uses: You ain't heard nothin' yet! See also aren't.
Etymology
Origin of ain't
First recorded in 1770–80; variant of amn't (contraction of am not ) by loss of m and raising with compensatory lengthening of a; cf. aren't
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“As the saying goes…this ain’t rocket science, well actually, rocket science is literally our daily business,” Musk joked as the stock plunged Tuesday evening.
From The Wall Street Journal ● Aug. 9, 2026
"This ain't even the ceiling," wrote, external Windows Central editor Jez Corden on X of Xbox's price increases.
From BBC ● Aug. 3, 2026
Not your typical work lunch, to be sure, but in these atypical times, it ain’t easy staying green.
From Slate ● Jul. 17, 2026
“The joke is I wanted a great room. I got a good room. It ain’t great,” he says wistfully.
From MarketWatch ● Jul. 6, 2026
“Still, that there’s a Wonder, ain’t it? A Wonder of the World.”
From "The Seven Wonders of Sassafras Springs" by Betty G. Birney
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
